Added option to take vertex colors, turn them into grayscale values and export as alpha transparency. Needed to create custom models using flag waving shader.

Author: CoDEmanX

blender_26/__init__.py

@@ -34,7 +34,7 @@
 bl_info = {
     "name": "Blender-CoD - Add-On for Call of Duty modding (alpha 3)",
     "author": "CoDEmanX, Flybynyt",
-    "version": (0, 3, 4),
+    "version": (0, 3, 5),
     "blender": (2, 62, 3),
     "location": "File > Import  |  File > Export",
     "description": "Export models to *.XMODEL_EXPORT and animations to *.XANIM_EXPORT",
@@ -159,6 +159,12 @@ class ExportXmodel(bpy.types.Operator, ExportHelper):
         default=True
         )
 
+    use_vertex_colors_alpha = BoolProperty(
+        name="As alpha",
+        description="Turn RGB vertex colors into grayscale (average value) and use it as alpha transparency. White is 1 (opaque), black 0 (invisible)",
+        default=False
+        )
+
     use_apply_modifiers = BoolProperty(
         name="Apply Modifiers",
         description="Apply all mesh modifiers except Armature (preview resolution)",
@@ -251,10 +257,6 @@ def draw(self, context):
         col.prop(self, "use_selection", "Selection only (%i meshes)" % meshes_selected)
         col.enabled = bool(meshes_selected)
 
-        col = layout.column(align=True)
-        col.active = self.use_version == '6'
-        col.prop(self, "use_vertex_colors")
-
         col = layout.column(align=True)
         col.prop(self, "use_apply_modifiers")
 
@@ -265,6 +267,15 @@ def draw(self, context):
         else:
             col.prop(self, "use_armature")
 
+        if self.use_version == '6':
+
+            row = layout.row(align=True)
+            row.prop(self, "use_vertex_colors")
+
+            sub = row.split()
+            sub.active = self.use_vertex_colors
+            sub.prop(self, "use_vertex_colors_alpha")
+
         col = layout.column(align=True)
         col.label("Advanced:")
 

blender_26/export_xmodel.py

@@ -35,9 +35,10 @@
 def save(self, context, filepath="",
          use_version='6',
          use_selection=False,
-         use_vertex_colors=True,
          use_apply_modifiers=True,
          use_armature=True,
+         use_vertex_colors=True,
+         use_vertex_colors_alpha=False,
          use_vertex_cleanup=False,
          use_armature_pose=False,
          use_frame_start=1,
@@ -77,9 +78,10 @@ def save(self, context, filepath="",
         result = _write(self, context, filepath,
                         use_version,
                         use_selection,
-                        use_vertex_colors,
                         use_apply_modifiers,
                         use_armature,
+                        use_vertex_colors,
+                        use_vertex_colors_alpha,
                         use_vertex_cleanup,
                         use_armature_pose,
                         use_weight_min,
@@ -117,9 +119,10 @@ def save(self, context, filepath="",
             result = _write(self, context, filepath_frame,
                             use_version,
                             use_selection,
-                            use_vertex_colors,
                             use_apply_modifiers,
                             use_armature,
+                            use_vertex_colors,
+                            use_vertex_colors_alpha,
                             use_vertex_cleanup,
                             use_armature_pose,
                             use_weight_min,
@@ -143,9 +146,10 @@ def save(self, context, filepath="",
 def _write(self, context, filepath,
            use_version,
            use_selection,
-           use_vertex_colors,
            use_apply_modifiers,
            use_armature,
+           use_vertex_colors,
+           use_vertex_colors_alpha,
            use_vertex_cleanup,
            use_armature_pose,
            use_weight_min,
@@ -568,7 +572,14 @@ def _write(self, context, filepath,
                             else:
                                 c = col.color4
 
-                            file.write("COLOR %.6f %.6f %.6f 1.000000\n" % (c[0], c[1], c[2]))
+                            if use_vertex_colors_alpha:
+
+                                # Turn RGB into grayscale by calculating average value
+                                file.write("COLOR 1.000000 1.000000 1.000000 %.6f\n" % ((c[0] + c[1] + c[2]) / 3))
+
+                            else:
+                                file.write("COLOR %.6f %.6f %.6f 1.000000\n" % (c[0], c[1], c[2]))
+
                         else:
                             file.write("COLOR 1.000000 1.000000 1.000000 1.000000\n")